Use the given information to write an equation. Let x represent the number described in the exercise. Then solve the equation and find the number.A number subtracted from eighteen is four.
A. 18 + x = 4; -14
B. 18 - x = 4; 14
C. 18 - 4 = x; 14
D. x - 18 = 4; 22
Answer: B
Mathematics
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Use the Trapezoidal Rule with n = 4 steps to estimate the integral.
A. 
B. 
C. 
D. 
Mathematics
Solve. Write the answer as a mixed number as needed.The floor of a rectangular room is to be tiled with 
foot square tiles along a 7
foot wall. How many tiles will be needed along the wall?
A. 2
tiles
B. 21
tiles
C. 22
tiles
D. 26 tiles
Mathematics
Find the vertex, focus, and directrix of the parabola. Graph the equation.(x + 1)2 = 8(y + 2)
A. vertex: (-1, -2)
focus: (1, -2)
directrix: x = -3
B. vertex: (-1, -2)
focus: (-1, 0)
directrix: y = -4
C. vertex: (1, 2)
focus: (1, 4)
directrix: y = 0
D. vertex: (1, 2)
focus: (3, 2)
directrix: x = -1
Mathematics
Determine if the relation is a function.
A. not a function B. function
Mathematics